Analog auto-correlation method for use in wireless communications for spectrum sensing of cognitive radio, involves detecting signal type based on correlation data matching with signature associated with preset time delay

摘要

The method involves providing an analog current input signal and an analog delayed signal that lags behind the analog current input signal by a preset time delay. The analog current input signal is correlated with the analog delayed signal to generate correlation data. A signal type e.g. IEEE 802.11aorthogonal frequency division multiplexing (OFDM) signal, is detected based on the correlation data that matches with a signature of the signal type, where the signature is associated with the preset time delay. An independent claim is also included for a system for analog auto-correlation.